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(No Model.) 7 Sheets-Sheet 1.

G. W. FULLER.

. DYNAMO ELEOTRIO MACHINE.

N0. 294,458. Pgtented Mar. 4, 1884.

w wwwww (No Model.) 7 Sheets-Sheet 2. G. W. FULLER. DYNAMO ELECTRIGMACHINE.

Patented Mar. 4, 1884.

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N PUERs Phom ma (No Model.) Tweets-Sheet 3.

. G. w. FULLER,

, DYNAMO ELECTRIC MAGHINE. No. 294,458. Patented Mar. 4; 1884.

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(No Model.) 7 Sheets-Sheet 4.

e. w. FULLER. DYNAMO ELECTRIC MACHINE.

No. 294,458. Patented Mar. 4, 1884.

1 '1 Sheets-Sheet 5. G. W. PULLER. DYNAMO ELEOTRIG MACHINE.

Patented Mar. 4, 1884.

(No Model.)

17? van 74 0 N W kl, k7 1 i I I I 7 SheetsSheet 6. G. W. FULLER.

. I DYNAMO ELECTRIC MAG No. 294.458. P ed Mar. 4, 1884.

(No Model.)

7 SheetsSheet 7.

(No Model.)

G. W. FULLER.

DYNAMO ELECTRIC MACHINE.

v No. 294,458. Patented Mar. 4, 1884.

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with each other and with the commutator lhvrrao STATES PATENT Cariesenonon wru'nnnn, or uonu ioir, oonnncricur DYNAMO-ELECTRlC MACHINE.

SPECIFICATION forming part of Ia etters Patent No. 294,458, dated March4-, 1884.

l Application filed Februa y 19, 1883. (No model.)

To all whom it may concern: 1

tain Improvement in Dynamo-Electric Machines, of which the following isa specification. Y

Myimprovements relate to the application, to dynamo-electric machineshaving cylindrical armatu-res of my invention, of an arm aturecoreindependent of the induction-coils surrounding it, and held inunchanging polar relations to the field-magnets. by the attractive forceof the field-magnets. This characteristic being common to severalmachines, Which I have described in other pending applications,

I designate the present case as Case E. In

this case my armature-core is o'fcylindrical form, and is looselymounted upon a rotating shaft, upon which the induction-bars aresupported, and. by which they are rotated, the field-magnets beingstationary, Mypresent invention also includes a special arrangement offield-magnets in connection with polepieces, and a method of soconnecting the induction-bars which traverse the armature with eachother and with thetcommutator that vI am enabled to avoid greatelongation of the armature. y u

The accompanying drawings of a dynamoelectric machine embodying myimprovements are as follows: Figure 1 is a topview. Fig. 2 is a frontend elevation of the armature and adjacent parts. Fig. 3 is a rearendelevation of the armature and adjacent parts.' Fig. 4 is a transversevertical section through the line 0 v on Fig. 1; Fig. 5 is a horizontalvertical section through the line ww on Fig. 1. Fig.

6 is a vertical sectionthrough the line as m on, Fig. 1.

Fig. 7 is a sectional end elevation, upon anenlarged scale, of thecommutator,

brushes, and adjacent parts. Fig, Sis a trans verse section through oneof the brush-holders on line z of Fig. 7 Fig. 9 is a diagram drawnvwithout regard to scale or relative proportion of the parts shown, forthe purpose of indicating the mode in which the groupsof inductionbarsare, by means of insulated rings ,at the end of the'armature,appropriately connected strips.

is intended for the generation of currents large in quantity, but low inelectro-motive force. It has a substantial bed, A, which maybe made ofheavy plank or masonry. Two rows of standards, B b, are arranged,respectively, across the opposite ends of the bed A, to which they arefastened by suitable bolts. these standards is an iron bar, serving. asa yoke-piece for one of the upper and one of the lower members of thegroups of longer fieldmagnets C C c 0. These magnets have hollow cores,the outer ends of which abut against the faces of the yokes. andtheirinner ends against shoulders upon the pole-pieces D d. The yokes andcores are fastened to the polepieces by means of the bolts C 0 which attheir inner ends screw into holes tapped in the pole-pieces, andat theirouter ends project through holes in the yokes or standards, andareprovided with a screw-thread to receive the nuts C 0 by which thepole-pieces, cores, and yokes are clamped together.

Immediately within the group of longer field-magnets. are arrangedsimilar groups of shorter field-magnets, C C c c, the cores of which arealso hollow, and abut against suitable shoulders on the pole-pieces D d,and are secured in position by means of the bolts C c, the inner ends ofwhich are screwed into holes tapped in the pole-pieces D (1, while theirouter ends project through holes in the shorter yokes B b,.and areprovided with screw-threads for the reception of the clamping-nuts C a,by which the shorter yoke-pieces and cores are fastened to thepole-pieces. The upper and lower poles of the field-magnets are made upof separate sections. The sections D D D D D D, composing the upperpole,are clamped together by the horizontal bolt E, and the sections'd dd" d (1 cl?, composing the lower pole, are clamped together by thehorizontal bolt 0. Each section of each pole has bolted to it upon eachside a net frame, the other parts of which consist of the cores of fourpairs of the longer and shorter The machine represented, in the drawingsfield-magnets .C o'e -0', .the four yoke-pieces Each of B B I) Z), towhich the outer ends of the field magnets are respectively secured, andthe tie plates F F, to which the opposed edges of the sections arerespectively secured by the screws The drawings represent a machinehaving six ofsuch n1agnet-frames, suitably secured in parallel planes.It will of course be understood that a larger or a smaller number ofsuch magnet-frames may be employed, if dc sired, the dimensions of theother parts of the machine being correspondingly altered, as may berequired.

The sections composing the poles are ores eent-shaped,and their opposedfaces are curved concentrically with relation to the axis of therotating cylindrical cage composed of the parallel induction-bars G,supported in equidis taut groups of five upon the peripheries of threerotating wheels, G G G", the hubs of which are secured to the rotatingshaft H.

The induetionbars are insulated from each other and from the wheels uponwhich they are supported, and areheld in position by theclampirig-segments r/ g g, which are severally secured by screws 57,inserted through the clampirig-segments and into the peripheries of thesupporting-wheels G G" G", respectively.

To afford clearance for the clamping-segment g and the screws 9, whichfasten the clamps to the periphery of the wheel G the middle pair ofmagnet-frames are separated by means of the washers G", which areinterposed between the pole-pieces D and D and cl" and cl, respectively,through which the bolts E and 6 respectively pass.

The core of the armature is divided into two sections by theinterposition of the wheel 13. These sections are respectively composedof the short hollow cylinders of iron, I I 1 I and i t" i, which aresupported by the arms J J J" and j projecting radially from the hubs JJ" J"j 7 9' mounted upon the sleeves 7L h, which loosely inclose thearmature-shaft 11', so that the shaft H may be rotated without rotatingthe sleeves h 72. The outer portions of the radial arms J J J j j areinterposed, respectively, between the cylinders I I I I 1'- t i if", andare perforated to receive the bolts K k, which are inserted throughsuitable holes in the shells of the cylinders,and are provided at theirouter ends with the nuts K 1' k 76, by means of which the cylinders areclamped to each other and to the ends of the radial arms.

The armaturc-shaft H is provided with the bearing H at the rear of themachine, and is prolonged to receive a driving-pulley, if the machine isdriven by a belt, or to receive a crank when the machine is driven bydirect connection with the piston of a steam-engine. At its front endthe shaft H is provided with the bearing H, which projects sufficientlyfar from the wheel G" to afford room for the commutator M and the nestsof concentric connecting-rings N, to which the front ends of theinduction-bars G are appropriately con- ,mutator M.

nected. Similarly, the bearing H at the rear end of the machine issufficiently distantfrom the wheel G to afford room for the nests ot'connecting-rings a, to which the rear ends of the induction-bars G areappropriately coir nectcd.

The induction-bars G are arranged in tw entyfour groups, 0 O O, &c.,each composed of live bars. The bars of the diametrically-oppositegroups are in each case electrically connected with each other inseries, so as to leave two terminals, which are respectively connectedto two diametrically-opposite strips of the com- As there aretwenty-four tcrminals for the groups of induction-bars,the commutator isprovided withtwenty-four insulated strips, on. nection of the bars ofeach group with the bars of the diametrically'opposite group is effectedby means of insulated rings at the ends of the armature. There being onehundred and twenty induction-bars, there are required at the rear end ofthe armature sixty connecting-rings. Fifty-six of these rings arearranged in eight parallel vertical planes, each plane containing a nestof seven rings. The remaining four rings are affixed to a sleeve mountedupon the commutator-shaft. Each ring has affixed to it, on oppositesides, two outwardly projecting connecting arms, the ends of which arefastened, respectively, to the rear ends of two of the induction-bars oftwo diametrically-opposite groups.

The connecting-arms have the same solid cross area as theinduction-bars; but the rings have one-half the solid cross area. Aswill be seen, they are flattened rings, and they present two paths-rightand left-for the current from one arm to the other, the sum of the crossareas of which is equal to the cross area of one induction-bar.

The relative positions of the nests of con necting-rings are shown inFig. 5, in which it will be seen that the members of the three pairs ofinterior nests are placed in close proximity to each other, so that theconnectingarms can be arranged in four parallel vertical planes.

The fourteen connectingarms seven on each side of the shaft) attached tothe innermost nest of rings are fastened to the outer faces of thoserings. The fourteen connecting-arms attachedto the second nest of ringsare fastened to the inner faces thereof, two other connect-ingarms beingcarried inward through the first and second nests of rings, and fastenedon opposite sides, respectively, to the periphery of the ring on theshaft which is in line with the space between the first and second nestsofrings. Similarly, the fourteen connecting-arms attached to the thirdnest of rings are fastened to the outer faces thereof, and the fourteenconnectingarms attached to the fourth nest of rings are attached to theinner faces thereof, the two additional arms in that case, as before,being attached to the ring in line with the spacebe- The appropriateelectrical con-' aria res 3 tween the third and fourth nests of rings.Again, the fourteen connectingarms of the fifth and seventh nests ofrings are attached, respectively, to the outer faces of those rings, andthe fourteen connecting arms of the sixth and eighth nests of .rings areattached to the p I inner faces thereof, the additionalconnectingarms ineach case,as before, being attached to the rings in line with the spacesbetween the fifth and sixth and seventh and eighth nests of rings,respectively.

On the front end of the machine the-twentyfour terminals of the variousgroups of induction-bars are connected with the comn1utatorstrips, andhence at the front end of the armature twelve less connectingrings arere quired, or forty-eight in all. At the front end, therefore, there areeight nests, each consisting of six rings. The manner in which theseconnections are effected is illustrated in Fig. 9, which is a diagramdrawn without regard to scale, and arbitrarily representing the frontend of the armature and the commutator-strips, indicating in solid blacklines the connectingarms by which the front ends of the inductionbarsare connected to their appropriate rings and to the commutator-strips,and indicating 4 in parallel dotted lines, in close proximity to thesolid lines, the connections of the rear ends of the induction-bars withthe rings at the rear ends of the armature. The nests of rings at therearend of the armature are numbered 1, 2, 3, 4, 5, 6, 7, and 8,respectively, and the rings upon the shaft are numbered, respectively, 18 1-, 51 and 7 The nests of rings at the front end of the machine arenumbered, respectively, 1, 2, 3, 4, 5, 6, 7, and 8, and these figuresadjoining the arrow'heads at the ends of the solid and dotted lines,respectively, in Fig. 9 indicate to which nest the rings to which theconnecting-arms are attached re-' spectively belong, and also thepositions of the said rings relatively to the other rings in the nestsof which they are respectively members.

It will be seen that by this mode of connection all of thecommutatorstrips upon the lower side of the neutral plane are of onepolarity, and all the commutator-strips upon the other side of theneutral plane are of the oppositepolarity.Collecting-brushesqaretherefore arranged to bear upon all of the-strips,

both above and below the neutral plane, as shown in Fig. 7.

The brushes are carried, respectively, in suitably-insulated segmentalbrush-holders, Q Q. Q Q, which are suitably insulated from the adjacentparts of the machine, and are electrically connected, respectively, withthe binding-posts R r, as seen in Fig. 2, to which the terminals of theoutside circuit are respectively connected. The commutator-brushes areliterally brushes with flexible wire teeth. The segments in which theteeth are sup ported are made capable of radial adjustment by means ofthe slotted holes in the ears q, through which are inserted the bolts bywhich the seg mental brush-holders are screwed to a supporting-disk, (f,which is fastened by means of set-screws upon the inner end of the boxin which the armature-shaft has its bearing H In operation, thecylindrical core of the armature is held stationary by the magneticattraction of the field-magnets, and to insure that the shaft II willturn freely in the sleeves h and h without imparting rotation to them,each of these sleeves has formed in its lower portion a longitudinaloil-cavity, S. Strips of cotton wicking are laid edgewise in thecavities S, respectively. The upper edges of these strips bear,respectively, upon those parts of the periphery of the shaft H which aresurrounded by the sleeves h h, which, as will be seen, are of largerdiameter than the adjoining portions of the shaft H. The ends of thecavities Sare closed by means of plates which are bolted to the ends ofthe sleeves h it, respectively. The parts of the shaft inclosed by thesleeves hh are oiled, and oil is supplied to the cavities S through thetubes S S, inserted into the upper ends of the holes 3 s, bored throughthe sleeves h h, respectively. These holes are inclined to the radius ofthe shaft, as shown in Fig. 4c, in which the direction of rotation ofthe shaft H is indicated by the arrow Owing to the enlarged diameter ofthe parts of the shaft surrounded by the sleeves h h, respectively, theeffect of centrifugal force is to keep the oil upon the periphery of theenlarged portion, and to prevent it from spreading lengthwise upon theadjoining parts of the shaft, which are of smaller diameter.

I am aware that in cylindrical armatures heretofore designed theinduction-coils have been arranged to rotate around an iron core fixedto a stationary shaft, by supporting the coils upon suitable hea'dsorwheels affixed to sleeves or hubs surrounding external portions of saidshaft, the necessary power to rotate the coils being imparted by meansof a belt engaging a pulley affixed to one of the heads. The featureswhich distinguish my invention from such previously-designed armaturesconsist of the rotating armature-shaft, to which the wheels forsupporting the induction-bars are affixed, and the loose mounting of theiron core upon the said shaft.

I claim as my invention- 1. In a dynamoelectric machine havingstationary field magnets and a cylindrical IIO armature, a rotatingsystem of induction-bars,

arranged in the form of a cylindrical cage and loosely surrounding astationary cylindrical iron core. 7

2. In a cylindrical armature for a dynamo electric machine, provldedwith longitudinally ,circumposed groups of in duction-bars, a seriesprovided with the oil-supply hole 8, extending through the upper part ofthe sleeve and I5 terminating at its lower end in the oil-czwity S,formed in the interior surface of the sleeve and containing astrip ofsuitable material for absorbing oil, in combination with the enlargedpart of the shalt lL vhich the sleei'e surroululs, 20

as and for the purposes set forth.

GEO. \V. FULLER.

\Vitnesscs:

.Tos. C. Enema, J. H. SIIUMWAY.

